diff --git a/Tools/msi/msi.py b/Tools/msi/msi.py
index 4420c1766a8..978e7f74c74 100644
--- a/Tools/msi/msi.py
+++ b/Tools/msi/msi.py
@@ -376,7 +376,7 @@ def add_ui(db):
               ("VerdanaRed9", "Verdana", 9, 255, 0),
              ])
 
-    compileargs = r'-Wi "[TARGETDIR]Lib\compileall.py" -f -x bad_coding|badsyntax|site-packages "[TARGETDIR]Lib"'
+    compileargs = r'-Wi "[TARGETDIR]Lib\compileall.py" -f -x bad_coding|badsyntax|site-packages|py2_ "[TARGETDIR]Lib"'
     # See "CustomAction Table"
     add_data(db, "CustomAction", [
         # msidbCustomActionTypeFirstSequence + msidbCustomActionTypeTextData + msidbCustomActionTypeProperty